[PATCH v1] iio: adc: ad_sigma_delta: Clear pending interrupts before enable

[Markus Burri]

For device will enable and disable irq contiously like AD7195,
it use DOUT/RDY pin for both SPI transfer and data ready.
It will disable irq during SPI transfer, and re-eanble irq after SPI transfer.
That may cause irq status bit set to 1 during spi transfer.

When the active condition has been detected, the corresponding bit
remains set until cleared by software. Status flags are cleared
by writing a 1 to the corresponding bit position.

Signed-off-by: Markus Burri <markus.burri@xxxxxx>
---
 drivers/iio/adc/ad_sigma_delta.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c
index a602429cdde4..59544c39642a 100644
--- a/drivers/iio/adc/ad_sigma_delta.c
+++ b/drivers/iio/adc/ad_sigma_delta.c
@@ -515,6 +515,10 @@ static irqreturn_t ad_sd_trigger_handler(int irq, void *p)
 
 irq_handled:
 	iio_trigger_notify_done(indio_dev->trig);
+	/*
+	 * ACK pending interrupts from spi transfer.
+	 */
+	irq_gc_ack_set_bit(irq_get_irq_data(sigma_delta->spi->irq));
 	sigma_delta->irq_dis = false;
 	enable_irq(sigma_delta->spi->irq);
 
-- 
2.39.2